Stop motion for twister frames



Aug. 30, 1932. G. GoobcHlLD sToP MOTION Fon 'rwIsTEa FRAMES Filed May 27, 1930 Patented Aug. 30, 1932 GEORGE GOOIDGHILD, OF SACO,

MASSACHUSETTS, A GOREQR STOP MOTION FOR Applicatcn led May .7,

This invention relates to twister frames and more especially to automatic stop motions for machines of this type.

ln twisting together two or more strands '5f of thread or yarn to produce a composite strand of coarser gage it is important to Istop the thread feeding operation in the event that one or more strands break, since otherwise the machine will continue to maire 1G a defective product and a snarl also may be created which will necessitate stopping the entire machine. For this purpose it has been customary Aheretofore to equip twister frames with an apparatus, commonly known as a trap motion, for stopping the feed of all the strands running to a single bobbin in the event that one or certain strands break. The arrangement most commonly used comprises a feeler for engaging the twisted or com- 253 posite strand between the feed rolls and the twister mechanism, and some means under the control of said feeler for stopping the feed ofthe individual strands when the twisted strand breaks. There are available also trap motions for stopping the feeding of all of the strands being twisted together when any strand breaks. Such stopping of the feeding movement of thestrands may bel eifected either by interrupting the action of the feed 3G rolls, severing the stra-nds, or clamping them at points behind the feed rolls so that the motion of the feed rolls will break them.

There are many conditions, however, which stop kmotions of the kinds above described cannot handle satisfactorily, and thepresent invention deals more particularly, although not exclusively,- with such conditions. It aims to devise a stop motion for twister frames which will take care of a wider range 4@ of conditions than those heretofore common ly used, and which will be extremely reliable in operation, while at the same time kbeing economical to manufacture.

Under some circumstances it is' desirable not only to stop the feeding of the individual strands to the bobbin on which the twisted strand vmade Vfrom them is being wound, but also to stop'the rotation of the bobbin so that the piecing up operation will be fa- 50 cilitated. In fact, if the bobbin were not MAINE, ASSIGNOR T0 SACO-LOWELL SHOPS, 0F BCSTON,

ATION OF MASSACHUSETTS TVISTER FRAMES 1G30. Serial No. 456,124.

stopped the unbroken strands would keep on feeding. The bobbin, therefore, must be stopped. It is one of the objects of the present invention to devise a thoroughly satisfactory mechanism for performing this operation.

The nature of the invention will be readily understood from the following description when read in connection with the accompanying drawing, and the novel features will be particularly pointed out in the appended claims.

ln the drawing,

Figure l is a view, partly in side elevation and partly in vertical section, illustrating those parts of a twister frame with which the present invention is more especially concerned; and

Fig. 2 is a perspective view showing certain details of the construction illustrated in The drawing shows the invention as applied to a ring twister frame of a common type, one of the spindles of the frame being shown at 2, and the spindle including a bearing blade which is mounted in a bearing bolster 3 supported in a spindle rail 4. The

ring rail has been omitted in order to simplify the drawing. F or this reason also the illustration has been confined chie-fly to the mechanism associated with a single spindle. Tt has been assumed in the drawing that three strands 5 of thread or yarn are being twisted together to produce a single thread. These strands are guided over the usual guides 6 and 7 to the upper feed roll S, travelling to and partly around it and the feed roll l0, thence through the traveller, and to the bobbin or spool l2. The lower feed roll 10 is positively driven, and the upper roll 8 simply rests on it and is driven by its contact with the lower roll. For this purpose it is supported by an arm la pivoted on a rod or shaft lt will be evident that if the rolls are separated their grip on the strands 5 will thereby onthe strands 5 will be interrupted. The stop motion shown is arranged to interrupt thel feed in this manner.

This stop motion comprises three detec- Cal be released and their feeding action tors 16, one for each strand, and each detector is provided with an eye 1T through which its respective strand runs. Each de tector has the form of a bell crank lever and includes an 'arm 18 designed to be engaged under certain conditions by a striker which consists of an arm provided with a shouldered head 21. This arm is mounted .fast on a rock shaft 22 which runs substanthe eccentric from an upright shaft 27, carrying a worm wheel 28, driven by a worm on the shaft 31. This mechanism serves to oscillate the striker' 20 constantly.

Normally the detectors 16 are supported in the positions in which they are shown in Figs. 1 and 2 with their arms 18 above the path of travel of the striker 20. When any strand 5 breaks, however, the detector for that particular strand falls, swinging in a clockwise direction, until its arm 18 rests on the horizontal surface of the striker head 21. Upon the next forward stroke of the striker it acts through the fallen detector to straighten a toggle mechanism which comprises two links 32 and 33, respectively, arranged one above the other. The lower link swings on the pivot stud 34, the axis of which is fixed, while the upper link is pivoted at 35 to the n arm 14 which supports the upper feed roll 8. The two links are pivoted together at 36 and the lower link is provided near its upper end with a small arm 37 to which all three of the detectors 1G are pivoted. Conse uently,

when a detector drops dueto the brea :ing of its strand and it is engaged by the striker 21, the straightening movement of the toggle which is produced immediately thereafter lifts the upper feed roll 8 out of contact with its cooperating feed roll 10 and stops the feeding of all the strands, thus interrupting the normal twisting operation.

As above indicated, it is desirable at the same time to stop the motion of the bobbin,

and for this purpose the upper toggle link 33 is provided with a forwardly extending arm 38, rigid with the link 33, and an upright rod 40 is pivoted to this arm and eX- tends through a vhole in a yoke-shaped lever 41. Nuts 42 are threaded on this rod below the lever 41. The whirl 43 on the spindle 2 is provided with a cone clutch member 44 arranged to drive a cooperating tapered clutch member 45 which forms a part of a bobbin support 46, this support having the usual key .47 tol drive the bobbin. The yoke 41 straddles the clutch member 46and is fulerumed on thebearing frame at 48. `Pivoted to it is a brake ring 50 which lies immediately under the flange of the bobbin support 46 and carries a friction facing material 51 on ghe upper side thereof to engage with said ange.

Normally the parts are in the relationship shown in Fig. l with the bobbin support 46 in driven engagement with the driving cone clutch member 44 of the whirl 43 so that the bobbin at this time is bein revolved. lVhen the toggle 32-33 is straig tened in the man-` When the machine attendant has pieced up f theV broken strand or strands she pulls forward on the handle 52, which is integral with or rigidly secured to the upper toggle link 33, thus breaking the to gle, allowing the upper feed roll 8 to drop into Contact with its cooperating roll 10, and at the same time lowering the bobbin vsupport 46y into engagement with the clutch member 44, and causing the bobbin to start up.

As the bobbin support 46 settles down and vthe tapered clutch member 45 engages the driving clutch member 44, it is important that the contact between these clutch members take place in such a manner that the bobbin will come up to speed smoothly and without anyviolent jerking motion. This is accomplished by tapering the clutch surfaces ap roximately as shown, and'more particular y by maklnfr the driving clutch member 44 of asbestos bre which is unitedl with a binder and hardened by heat.

Clutch facin brake lining materials used in the automo ile industry, and known as felted fibre linings or facings, answer this purpose exceptionally well, and provide that degree of frictional contact necessary for smooth operation much better than any other materials kwhich I have been able to obtain.

` This same material maybe used for the facing 51, although leather, fibre board, anda "i considerable variet of other substances may be employed at t is point. The ring 50 should be ivoted to the yoke 41 approximately parallelpto the fulcrum of said yoke so ythat the ring can rock to adjust itself to the flange of thel bobbin support 46 as the lever 41 is raised. One of the pivots for this ring is indicated in the drawing at 52, and bothpivots are in line withkthe axis of the spindle but extend transversely to said axis.

, It will now be clear that the invention provides an automatic stop motion for twisters which is relatively simple in organization, is extremely reliable, and whichcan be manufactured and assembled economically. It is ened by movement transmitted convenient to operate, and because of the use of the toggle construction requires relatively little power. rlfhe drawing shows an arrangement in which three strands are being twisted together and in which, consequently, three detectors are used, but it is obvious that the apparatus could ecually as well be adapted to handle a different number of strands.

While l have herein shown and described a preferred embodiment of my invention, it will be understood that the invention may be embodied in other forms without departing from the spirit r scope thereof.

Having thus described my invention, what l desire to claim as new is:

l. in a twister frame, the combination with means for feeding individual strands to be tv-.fisted together, of detectors for enga-ging said respective strands, said detectors being arranged to be supported normally by the respective strands, a power operated striker for engaging any of said detectors when respective strand allows it to fall, a toggle mechanism arranged to be straightfrom said striker through a fallen detector, and means its for causing said straightening movement lof the toggle mechanism to stop the feeding of said strands.

2. ln a twister frame, the combination with rolls for feeding individual strands to be twisted together, of detectors for engaging said respective strands, said detectors being arranged to be supported normally by the respective strands, a power operated striker for engaging any of said detectors when its respective strand allows it to fall, an upright toggle mechanism associated with said detectors to be straightened by movement transmitted from said striker to said mechanism through any fallen detect-or, and a support for the upper of said feed rolls associated with said toggle mechanism to cause the straightening movement of said mechanism to separate said feed rolls.

3. ln a twister frame, the combination with means for feeding individual strands to be twisted together and a bobbin on which the twisted thread is wound, of detectors for engaging said respective strands and arranged to be supported normally by them, a power driven striker for engaging any one of said detectors when its respective strand allows it to fall, a toggle mechanism on which said detectors are movably mounted to cause said striirer to transmit movement to said toggle mechanism through any fallen rdetector and thereby to straighten the toggle mechanism,

and means for causing said straightening `movement of the toggle mechanism to stop the twisting operation.

et, In a twister frame, the combination with means for feeding individual strands to be twist-ed together and a bobbin on which the twisted thread is wound, of detectors for engaging said respective strands and arranged to'be supported normally by them, a power driven striker for engaging any one of said detectors when its respective strand allows itv to fall, `a toggle mechanism arranged to be straightened by movement transmitted thereto from said striker through a fallen detector, and means for causing said straighttector, a spindle, a friction clutch member carried by said spindle, a support for said bobbin having a clutch member arranged to engage and be driven by the first mentioned clutch member to drive said bobbin support and the bobbin mounted thereon, and connections for utilizing the straightening move ment of said toggle mechanism to disengage said clutch members and to stop the bobbin. 6. n a twister frame, the combination with means for feeding individual strands to be twisted together and a bobbin on which the twisted thread is wound, of an upright spindie including a bearing blade, a bearing bolster supporting said spindle for rotation, a whirl rigidly mounted on said spindle, a driving cone clutch member of hardened asbestos carried by said whirl, a bobbin support slidable relatively to said spindle and mounted immediately above said clutch member, a driven clutch member carried by said bobbin support and tapered to engage the conical surface of said driving clutch member, detectors for engaging said respective strands' and arranged to be supported normally by them, and power operated means arranged to be brought into operation by the failure of any strand to support its respective detector to lift said bobbin support suiciently to interrupt the driving engagement between said clutch members while said spindle continues to revolve.

7. In a twister frame, the combination with an upright spindle having a bearing blade, a bolster supporting said spindle. for rotation, a whirl secured fast on said spindle, a

conical driving clutch member rigid with said whirl, a bobbin support slidable on said spindle, a tapered driven clutch member rigid with said bobbin support and arranged to engage said conical clutch member, a yoke straddling said driven clutch member, and a part carried by said yoke for engaging said` bobbin support to lift the clutch member carred thereby out of cooperative relationship t0 vsaid driving clutch member and stop said bobbin support While the spindle continues to rotate.k l

8. In a twister frame, the combination of an upright spindle, a Whirl rigidly mounted Ion said spindle, a bearing mechanism Oper- Aatvely supporting said spindle for rotation, a driving cone clutch member carried by saidy Whirl, a bobbin support slidable relatively to said spindle and mounted immedi- `ately above said clutch member, a driven clutch member Carried by said bobbin support and tapered to engage the conical sur- .face of said driving clutch member, a pivoted yoke straddling said driven clutch member land a, horizontal brake ring pivoted to said yoke substantially in alinement with the axis of said spindle and arranged to engage said bobbin support to lift its Clutch member out y of cooperative relationship to said driving clutch member and stop said bobbn support while the spindle continues to rotate.

, GEORGE GOODCHILD.V 

